On a quiet morning in Kasukabe, Shin-chan and his friends discover that the city is in danger due to a new villain, the terribly ridiculous Higure Maō, who has a master plan to conquer the world: turning everyone into his "High Gure" followers. Meanwhile, the fierce battle between heroes and villains intensifies when Action Kamen, Shin-chan's idol, returns to action to save humanity. But in an unexpected twist, Higure Maō manages to capture Action Kamen, putting the fate of the city at risk and leaving Shin-chan desperate to help.
With his usual mischievous style, the five-year-old little hero decides to form a team with his closest friends: Kazama, Nene, Nene, and Bo-chan. Determined to rescue Action Kamen and stop the malevolent Higure Maō, the kids embark on a series of hilarious adventures that lead them to face all sorts of absurd obstacles, from costume battles to fights in a ramen shop.
As they fight with everything they have, Shin-chan must also find a way to use his wit to outsmart the villain’s plans and prove that laughter and friendship are the best weapons. In this fun and exciting movie, friendship is put to the test, and Shin-chan becomes a true hero, leading his group into an epic battle that will leave everyone laughing and thrilled.